For the cell \(Zn | Zn^{2+} || Cl^- | Cl_2\); the E° value is +2 1. V. Therefore

this can constitute a battery and produce electricity

The correct answer is option 2. this can constitute a battery and produce electricity.

A voltaic cell is a device that converts chemical energy into electrical energy. The cell potential, E°, is the difference between the standard electrode potentials of the two half-cells in the cell. A positive cell potential indicates that the reaction is spontaneous, while a negative cell potential indicates that the reaction is non-spontaneous.

In this case, the cell potential is positive, so the reaction is spontaneous. This means that zinc will be oxidized to Zn²⁺, and Cl₂ will be reduced to Cl^-.

The cell reaction would be:

\(Zn + Cl_2 \rightarrow Zn^{2+} + 2Cl^-\)

The cell can be used to produce electricity by connecting the two half-cells with a wire. The electrons will flow from the anode to the cathode, generating an electric current.

The other options are incorrect. Option (1) is incorrect because the cell can function as a voltaic cell. Option (3) is incorrect because the cell reaction does occur. Option (4) is incorrect because the cell reaction is spontaneous.

Therefore, the correct answer is (2).